Autor segons l'article: Belmonte A; Lama G; Cerruti P; Ambrogi V; Fernández-Francos X; De La Flor S
Departament: Enginyeria Mecànica
Autor/s de la URV: De la Flor Lopez, Silvia / Fernández Francos, Xavier
Paraules clau: Thermosets Stresses Shape-shifting Polymers Network structure Liquid-crystalline network Liquid-crystalline elastomers Free-standing Experimental study Epoxy click systems Dual-curing Behavior Actuator
Resum: © 2018 IOP Publishing Ltd. In this work, free-standing shape-memory thermally triggered actuators are developed by laminating 'thiol-epoxy'-based glassy thermoset (GT) and stretched liquid-crystalline network (LCN) films. A sequential curing process was used to obtain GTs with tailored thermomechanical properties and network relaxation dynamics, and also to assemble the final actuator. The actuation extent, rate and time were studied by varying the GT and the heating rate in thermo-actuation with an experimental approach. The results demonstrate that it is possible to tailor the actuation rate and time by designing GT materials with a glass transition temperature close to that of the liquid-crystalline-to-isotropic phase transition of the LCN, thus making it possible to couple the two processes. Such coupling is also possible in rapid heating processes even when the glass transition temperature of the GT is clearly lower than the isotropization temperature of the LCN, depending on the network relaxation dynamics of the GT and the presence of thermal gradients within the actuators. Interestingly, varying the GT network relaxation dynamics does not affect the actuation extent. As predicted by the analytical model developed in our previous work, the modulus of the GT layer is mainly responsible for the actuation extent. Finally, to demonstrate the enhanced control of the actuation, specifically designed actuators were assembled in a three-dimensional actuating device able to make complex motions (including 'S-type' bending). This approach makes it possible to engineer advanced functional materials for application in self-adaptable structures and soft robotics.
Àrees temàtiques: Signal processing Química Mechanics of materials Materials science, multidisciplinary Materials science (miscellaneous) Materials science (all) Materials science Materiais Interdisciplinar Instruments & instrumentation General materials science Engenharias iii Engenharias ii Electrical and electronic engineering Condensed matter physics Civil and structural engineering Atomic and molecular physics, and optics
Accès a la llicència d'ús: https://creativecommons.org/licenses/by/3.0/es/
ISSN: 1361665X
Adreça de correu electrònic de l'autor: xavier.fernandez@urv.cat silvia.delaflor@urv.cat
Identificador de l'autor: 0000-0002-3492-2922 0000-0002-6851-1371
Data d'alta del registre: 2024-09-07
Versió de l'article dipositat: info:eu-repo/semantics/acceptedVersion
Enllaç font original: https://iopscience.iop.org/article/10.1088/1361-665X/aac278
URL Document de llicència: https://repositori.urv.cat/ca/proteccio-de-dades/
Referència a l'article segons font original: Smart Materials And Structures. 27 (7):
Referència de l'ítem segons les normes APA: Belmonte A; Lama G; Cerruti P; Ambrogi V; Fernández-Francos X; De La Flor S (2018). Motion control in free-standing shape-memory actuators. Smart Materials And Structures, 27(7), -. DOI: 10.1088/1361-665X/aac278
DOI de l'article: 10.1088/1361-665X/aac278
Entitat: Universitat Rovira i Virgili
Any de publicació de la revista: 2018
Tipus de publicació: Journal Publications